JP2010133341A - Piston - Google Patents

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JP2010133341A
JP2010133341A JP2008310453A JP2008310453A JP2010133341A JP 2010133341 A JP2010133341 A JP 2010133341A JP 2008310453 A JP2008310453 A JP 2008310453A JP 2008310453 A JP2008310453 A JP 2008310453A JP 2010133341 A JP2010133341 A JP 2010133341A
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Japan
Prior art keywords
piston
opening
skirt
skirt portion
rib
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JP2008310453A
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JP4861394B2 (en
Inventor
Kenichi Omori
謙一 大森
Kazuyuki Nakai
一之 中井
Akihito Nomura
明史 野村
Kazuya Tanabe
和也 田邉
Satoru Ino
悟 伊能
Shinichi Wagatsuma
伸一 我妻
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2008310453A priority Critical patent/JP4861394B2/en
Priority to ITTO2009A000834A priority patent/IT1396406B1/en
Priority to US12/615,823 priority patent/US8453559B2/en
Priority to DE102009056630A priority patent/DE102009056630B4/en
Publication of JP2010133341A publication Critical patent/JP2010133341A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/04—Resilient guiding parts, e.g. skirts, particularly for trunk pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/001—One-piece pistons

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piston with transverse-rib through holes formed easily therein for suppressing the cost increase. <P>SOLUTION: In the piston 1 which includes a pair of mutually opposed longitudinal ribs 5, 5 individually formed with piston pin boss parts 4, 4 interconnecting mutually opposed piston skirt portions 3, 3 on a back side of a piston head 2, and a pair of transverse ribs 6, 6 interconnecting the mutually opposed longitudinal ribs 5, 5, the transverse ribs 6, 6 being formed with transverse-rib through holes 7, 7 at places proximal to the back side of the piston head 2, a skirt part opening 8 is formed by cutting away a part of the piston skirt portion 3 that is opposed to the transverse rib 6 and faces the transverse-rib through hole 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、コネクティングロッドがピストンピンを介して連結されシリンダ内を往復動するピストンに関する。   The present invention relates to a piston in which a connecting rod is connected via a piston pin and reciprocates in a cylinder.

一般に内燃機関におけるピストン・クランク機構では、シリンダ内を往復動するピストンのピストンヘッドの裏面に相対向するピストンピンボス部が突出し、両ピストンピンボス部の同軸のピン孔にピストンピンが嵌挿され、両端を支持された同ピストンピンの中央部にコネクティングロッドの小端部を連結する。   Generally, in a piston / crank mechanism in an internal combustion engine, a piston pin boss portion opposed to the back surface of a piston head of a piston reciprocating in a cylinder protrudes, and piston pins are fitted into coaxial pin holes of both piston pin boss portions. The small end portion of the connecting rod is connected to the central portion of the same piston pin that is supported.

このように、ピストンはピストンヘッドの裏面から相対向する一対のピストンピンボス部が突出しているので、内燃機関の運転で燃焼による爆発荷重がピストン頂面に作用すると、特にピストンスカート部の短いピストンでは、一対のピストンピンボス部の下端が互いに開くようにピストンヘッドが変形しやすく、ピストンの円滑な往復動の妨げとなる。   Thus, since the piston has a pair of opposed piston pin bosses projecting from the back surface of the piston head, when an explosion load due to combustion acts on the piston top surface during operation of the internal combustion engine, particularly in a piston with a short piston skirt portion. The piston head is easily deformed so that the lower ends of the pair of piston pin boss portions are opened to each other, which hinders smooth reciprocation of the piston.

そこで、ピストンの必要な剛性を確保するために、ピストンヘッドの裏面にリブを突出形成した例がある（例えば、特許文献１参照）。
特許文献１に開示されたピストンは、ピストンヘッドの裏面において対向するピストンスカート部間を相対向する各々ピストンピンボス部が形成された縦リブ（第１，第２側壁）が連結し、この相対向する縦リブ間を一対の横リブ（第１，第２連結部）が連結することで、ピストンの必要な剛性を確保している。 Therefore, in order to ensure the necessary rigidity of the piston, there is an example in which a rib is protruded from the back surface of the piston head (see, for example, Patent Document 1).
In the piston disclosed in Patent Document 1, longitudinal ribs (first and second side walls) each formed with a piston pin boss portion facing each other are connected between the opposing piston skirt portions on the back surface of the piston head. The required rigidity of the piston is ensured by connecting a pair of horizontal ribs (first and second connecting portions) between the vertical ribs.

特開２００７−３０９２７１号公報JP 2007-309271 A

横リブは、相対向する縦リブ間を連結する壁であるので、連結長さが短く大きい部位ではないので重量もそれ程重いものではないが、ピストンヘッドの裏面から延出していると、可及的に軽量化して慣性質量を減らそうとするピストンにとっては余計な重量負担となるので、特許文献１のピストンでは横リブの剛性確保にあまり影響しないピストンヘッドの裏面近傍に横リブ貫通口（空間部）を設けている。   The horizontal rib is a wall that connects the opposing vertical ribs, so the connection length is short and not a large part, so the weight is not so heavy, but it is possible if it extends from the back of the piston head Since the piston is designed to be lighter and reduce the inertial mass, the piston of Patent Document 1 has a lateral rib through hole (space) in the vicinity of the back surface of the piston head that does not affect the rigidity of the lateral rib. Part).

また、この縦リブ間を連結する横リブの横リブ貫通口は、ピストンヘッドの裏面にオイルを万遍なく付着しやすくして、オイルによるピストンの冷却効果を向上させることに役立つものである。   Further, the lateral rib through-holes of the lateral ribs connecting the longitudinal ribs make it easy to uniformly apply oil to the back surface of the piston head, and help to improve the piston cooling effect by the oil.

この横リブの横リブ貫通口は、ピストンの裏側から見ると、ピストンヘッドの裏面に近い奥に形成され、ピストンスカート部、一対の縦リブおよび他方の横リブに囲まれているので、ピストンヘッドの裏面側から工具を差し込んで横リブ貫通口を加工形成することが困難である。
そこで、特許文献１では、ピストン鋳造時に横リブ貫通口に相当する部分に置き中子を配置して鋳造成形している。 When viewed from the back side of the piston, the lateral rib through-hole of the lateral rib is formed in the back near the back surface of the piston head and is surrounded by the piston skirt portion, the pair of vertical ribs and the other lateral rib. It is difficult to process and form the transverse rib through-hole by inserting a tool from the back side of the plate.
Therefore, in Patent Document 1, the core is placed in a portion corresponding to the lateral rib through-hole at the time of casting the piston and cast.

このような置き中子を使用して鋳造する場合には、鋳造型の構成部材が多く、かつ複雑となり型費が嵩む上に、型分離時に置き中子を別途取り外す工数が発生してコストアップを招くことになる。   When casting using such a placement core, there are many components of the casting mold, and it becomes complicated and increases the cost of the mold. In addition, the number of man-hours for removing the placement core when separating the mold is generated, resulting in an increase in cost. Will be invited.

本発明は、かかる点に鑑みなされたもので、その目的とする処は、コスト上昇を抑えて横リブの貫通口を容易に形成することができるピストンを供する点にある。   This invention is made | formed in view of this point, The process which makes it the objective is to provide the piston which can suppress the cost increase and can form the through-hole of a horizontal rib easily.

上記目的を達成するために、請求項１記載の発明は、ピストンヘッドの裏面に互いに対向するピストンスカート部間を各々ピストンピンボス部が形成された一対の相対向する縦リブが連結し、前記相対向する縦リブ間を一対の横リブが連結し、前記横リブに前記ピストンヘッドの裏面近傍に横リブ貫通口を設けたピストンにおいて、前記ピストンスカート部の前記横リブに対向し前記横リブ貫通口に臨む部分が欠損されてスカート部開口が形成されたピストンとした。   In order to achieve the above object, the invention according to claim 1 is characterized in that a pair of opposing vertical ribs each having a piston pin boss portion are connected between the piston skirt portions facing each other on the back surface of the piston head. In a piston in which a pair of lateral ribs are connected between the longitudinal ribs facing each other, and a lateral rib through-hole is provided in the vicinity of the back surface of the piston head on the lateral rib, the lateral rib penetration is opposed to the lateral rib of the piston skirt portion. A piston having a skirt portion opening formed by removing a portion facing the mouth was formed.

請求項２記載の発明は、請求項１記載のピストンにおいて、前記スカート部開口が、前記ピストンスカート部を穿孔した穿孔欠損部であることを特徴とする。   According to a second aspect of the present invention, in the piston according to the first aspect, the opening of the skirt portion is a perforation defect portion obtained by perforating the piston skirt portion.

請求項３記載の発明は、請求項１記載のピストンにおいて、前記スカート部開口が、前記ピストンスカート部を先端縁から切り欠いた切欠き欠損部であることを特徴とする。   According to a third aspect of the present invention, in the piston according to the first aspect, the opening of the skirt portion is a notch defect portion formed by notching the piston skirt portion from a tip edge.

請求項４記載の発明は、請求項１から請求項３までのいずれか１項記載のピストンにおいて、前記スカート部開口の開口面積が、前記横リブ貫通口の開口面積よりも大きいか等しいことを特徴とする。   According to a fourth aspect of the present invention, in the piston according to any one of the first to third aspects, an opening area of the skirt portion opening is greater than or equal to an opening area of the lateral rib through-hole. Features.

請求項５記載の発明は、請求項４記載のピストンにおいて、前記ピストンの鋳造時に前記スカート部開口と前記貫通口とが共通のスライド中子により同時に鋳造成形されることを特徴とする。   According to a fifth aspect of the present invention, in the piston according to the fourth aspect, the skirt portion opening and the through-hole are simultaneously cast and molded by a common slide core when the piston is cast.

請求項６記載の発明は、請求項１から請求項４までのいずれか１項記載のピストンにおいて、前記ピストンの鋳造時に前記スカート部開口が同時に鋳造成形され、成形された前記スカート部開口に加工刃を外側から挿入して前記横リブの所要箇所に前記横リブ貫通口を切削加工することを特徴とする。   According to a sixth aspect of the present invention, in the piston according to any one of the first to fourth aspects, when the piston is cast, the skirt opening is simultaneously cast and processed into the formed skirt opening. A blade is inserted from the outside, and the transverse rib through hole is cut at a required position of the transverse rib.

請求項１記載のピストンによれば、ピストンヘッドの裏面に互いに対向するピストンスカート部間を各々ピストンピンボス部が形成された一対の相対向する縦リブが連結し、相対向する縦リブ間を一対の横リブが連結し、横リブにピストンヘッドの裏面近傍に横リブ貫通口を設けたピストンにおいて、ピストンスカート部の横リブに対向し横リブ貫通口に臨む部分が欠損されてスカート部開口が形成されているので、該スカート部開口を利用して共通のスライド中子がスカート部開口とともに横リブ貫通口を鋳造成形することができ、または該スカート部開口に加工刃を挿入して横リブ貫通口を切削形成することができ、いずれにしても置き中子を使用して鋳造するよりも少ない作業工数で簡単に横リブ貫通口を形成することができ、ピストンの製造コストの上昇を抑えることができる。
また、ピストンスカート部にスカート部開口を有することで、ピストンを軽量化して慣性質量をより一層減らすことができる。 According to the piston of the first aspect, a pair of opposing vertical ribs each having a piston pin boss portion are connected between the piston skirt portions facing each other on the back surface of the piston head, and a pair of opposing vertical ribs are connected. In the piston in which the horizontal rib is connected and the horizontal rib is provided with a horizontal rib through-hole in the vicinity of the back surface of the piston head, the portion facing the horizontal rib of the piston skirt and facing the horizontal rib through-hole is lost, and the skirt opening is Since the skirt portion opening is used, a common slide core can be cast with the skirt portion opening and the lateral rib through-hole, or a processing blade can be inserted into the skirt portion opening to form the lateral rib. The through-hole can be cut and formed, and in any case, the lateral rib through-hole can be easily formed with fewer man-hours than casting by using a setting core. It is possible to suppress the increase in the cost of production.
Further, by providing the skirt portion opening in the piston skirt portion, the weight of the piston can be reduced and the inertial mass can be further reduced.

請求項２記載のピストンによれば、スカート部開口が、ピストンスカート部を穿孔した穿孔欠損部であるので、横リブ貫通口を形成することができる必要最小限の穿孔欠損部をピストンスカート部に穿孔すればよく、ピストンの剛性を十分に確保することができる。   According to the piston of claim 2, since the skirt portion opening is a perforated defect portion obtained by perforating the piston skirt portion, the minimum necessary perforation defect portion capable of forming the lateral rib through hole is formed in the piston skirt portion. It is only necessary to perforate, and the rigidity of the piston can be sufficiently secured.

請求項３記載のピストンによれば、スカート部開口が、前記ピストンスカート部を先端縁から切り欠いた切欠き欠損部であるので、切欠き欠損部を比較的大きく形成して横リブ貫通口の加工を容易にするとともに、ピストンの軽量化を促進して慣性質量を益々低減することができる。   According to the piston of the third aspect, since the skirt portion opening is a notch defect portion in which the piston skirt portion is notched from the tip edge, the notch defect portion is formed to be relatively large and In addition to facilitating processing, the weight of the piston can be promoted and the inertial mass can be further reduced.

請求項４記載のピストンによれば、スカート部開口の開口面積が、横リブ貫通口の開口面積よりも大きいか等しいので、スカート部開口を利用した横リブ貫通口の加工を容易にすることができる。   According to the piston of claim 4, since the opening area of the skirt portion opening is larger than or equal to the opening area of the lateral rib through-hole, the processing of the lateral rib through-hole using the skirt portion opening can be facilitated. it can.

請求項５記載のピストンによれば、ピストンの鋳造時にスカート部開口と貫通口とが共通のスライド中子により同時に鋳造成形されるので、鋳造型の構成部材および作業工数を削減して製造コストの低減を図ることができる。   According to the piston of the fifth aspect, since the skirt portion opening and the through-hole are cast simultaneously by the common slide core at the time of casting the piston, it is possible to reduce the manufacturing cost by reducing the components of the casting mold and the work man-hours. Reduction can be achieved.

請求項６記載のピストンによれば、ピストンの鋳造時にスカート部開口を同時に鋳造成形し、成形されたスカート部開口に加工刃を外側から挿入して横リブの所要箇所に横リブ貫通口を切削加工するので、鋳造時の型の構成部材および作業工数をより削減し、スカート部開口を利用して横リブ貫通口を簡単に切削加工でき、加工工数を少なくして製造コストの低減を図ることができる。   According to the piston of claim 6, when the piston is cast, the skirt portion opening is cast and formed at the same time, and a machining blade is inserted into the formed skirt portion opening from the outside to cut the transverse rib through hole at a required portion of the transverse rib. Because it is processed, the number of mold components and work man-hours during casting can be further reduced, and the side rib through-holes can be easily cut using the skirt opening, and the manufacturing cost can be reduced by reducing the work man-hours. Can do.

以下、本発明に係る第１の実施の形態について図１ないし図５に基づいて説明する。
本実施の形態に係るピストン１は、内燃機関のシリンダ内を往復動するピストンであり、ピストンピンを介してコネクティングロッドが連結される。 Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS.
The piston 1 according to the present embodiment is a piston that reciprocates in a cylinder of an internal combustion engine, and is connected to a connecting rod via a piston pin.

ピストン１は、燃焼室側にピストン頂面を備えたピストンヘッド２と、ピストンヘッド２の外周部が裏面側に延出したピストンスカート部３と、ピストンヘッド２の裏面から突出した一対のピストンピンボス部４，４とからなり、ピストンスカート部３のピストンピンボス部４，４が相対する部分は欠損して一対のピストンスカート部３，３が相対向して対称に形成されている。   The piston 1 includes a piston head 2 having a piston top surface on the combustion chamber side, a piston skirt portion 3 in which an outer peripheral portion of the piston head 2 extends to the back surface side, and a pair of piston pin bosses protruding from the back surface of the piston head 2 The portion of the piston skirt portion 3 facing the piston pin boss portions 4 and 4 is missing and the pair of piston skirt portions 3 and 3 are formed symmetrically.

ピストンヘッド２の外周面にはリング溝２ｒが形成されている。
互いに対向するピストンピンボス部４，４には、ピストンピン（図示せず）が嵌挿される円形のピン孔４ｈ，４ｈが同軸に穿孔されている。
ピン孔４ｈ，４ｈの中心軸線Ｘ−Ｘに関して対して一対のピストンスカート部３，３は対称な位置に形成されている。 A ring groove 2 r is formed on the outer peripheral surface of the piston head 2.
Circular pin holes 4h, 4h into which piston pins (not shown) are inserted are coaxially drilled in the piston pin boss portions 4, 4 facing each other.
The pair of piston skirt portions 3 and 3 are formed at symmetrical positions with respect to the central axis XX of the pin holes 4h and 4h.

ピストンヘッド２の裏面において、互い対向するピストンスカート部３，３間を、相対向して対称に突出した一対の縦リブ５，５が連結している。
縦リブ５，５は、ピン孔４ｈ，４ｈの中心軸線Ｘ−Ｘに垂直は壁である。
この一対の縦リブ５，５は、各々中央に前記ピストンピンボス部４，４を膨出形成している。 On the back surface of the piston head 2, a pair of longitudinal ribs 5, 5 projecting symmetrically opposite to each other are connected between the piston skirt portions 3, 3 facing each other.
The vertical ribs 5 and 5 are walls perpendicular to the central axis XX of the pin holes 4h and 4h.
The pair of vertical ribs 5 and 5 respectively bulge and form the piston pin boss portions 4 and 4 at the center.

この一対の縦リブ５，５間を、中心軸線Ｘ−Ｘに関して対称位置に形成された一対の横リブ６，６が中心軸線Ｘ−Ｘに平行に連結してピストンヘッド２の裏面から突出して形成されている。
横リブ６，６は、それぞれピストンスカート部３，３に相対向し、ピストンヘッド２の裏面から縦リブ５，５と略同じ程度突出しており、ピストンスカート部３，３ほどには突出していない。 Between the pair of vertical ribs 5 and 5, a pair of horizontal ribs 6 and 6 formed symmetrically with respect to the central axis XX are connected in parallel to the central axis XX and protrude from the back surface of the piston head 2. Is formed.
The horizontal ribs 6 and 6 are opposed to the piston skirt portions 3 and 3, respectively, and protrude from the back surface of the piston head 2 to substantially the same extent as the vertical ribs 5 and 5, but do not protrude as much as the piston skirt portions 3 and 3. .

以上のピストンヘッド２の裏面に突出形成されたピストンスカート部３，３間を連結する一対の相対向する縦リブ５，５の間を一対の横リブ６，６が連結する構造であるので、ピストン１の剛性が高く、特に内燃機関の運転で燃焼による爆発荷重がピストン頂面に作用することによるピストンヘッド２の変形に耐えることができる。   Since the pair of lateral ribs 6 and 6 are connected between the pair of opposed longitudinal ribs 5 and 5 that connect the piston skirt portions 3 and 3 that are formed to protrude from the back surface of the piston head 2, The piston 1 has high rigidity, and can withstand deformation of the piston head 2 due to an explosion load acting on the piston top surface particularly when the internal combustion engine is operated.

前記横リブ６，６には、ピストンヘッド２の裏面近傍に横長の横リブ貫通口７，７が穿孔形成されている。
この横リブ６，６に穿孔される横リブ貫通口７，７によりピストン１を軽量化して慣性質量を減らすことができるとともに、横リブ貫通口７，７をオイルが通過できることでピストンヘッド２の裏面にオイルを万遍なく付着しやすくして、オイルによるピストンの冷却効果を向上させることができる。 The lateral ribs 6 and 6 are formed with perforated lateral rib through holes 7 and 7 in the vicinity of the back surface of the piston head 2.
The piston 1 can be reduced in weight by the lateral rib through-holes 7, 7 drilled in the lateral ribs 6, 6, and the inertial mass can be reduced, and the oil can pass through the lateral rib through-holes 7, 7. It is possible to improve the effect of cooling the piston by oil by facilitating the uniform attachment of oil to the back surface.

そして、本ピストン１の各ピストンスカート部３には、横リブ６に対向し横リブ貫通口７に臨む部分が穿孔されて略矩形に穿孔欠損されたスカート部開口８が形成されている。
このスカート部開口８の開口面積は、前記横リブ貫通口７より大きく、図２に示すように、ピストン１の正面視で、スカート部開口８の上部に偏った位置に横リブ貫通口７が対向していて、スカート部開口８を通して奥に横リブ貫通口７を見ることができる。 Each piston skirt portion 3 of the piston 1 is formed with a skirt portion opening 8 in which a portion facing the lateral rib 6 and facing the lateral rib through-hole 7 is perforated so as to have a substantially rectangular perforation.
The opening area of the skirt portion opening 8 is larger than that of the lateral rib through-hole 7. As shown in FIG. 2, the lateral rib through-hole 7 is located at a position biased to the upper part of the skirt portion opening 8 in front view of the piston 1. The lateral rib penetration port 7 can be seen in the back through the skirt opening 8.

ピストンスカート部３にスカート部開口８を有することで、ピストン１を軽量化して慣性質量をより一層低減することができる。
スカート部開口８が、ピストンスカート部３を穿孔した穿孔欠損部であり、ピストンスカート部３の下端縁は連続しているので、爆発荷重がピストン頂面に作用しても、一対のピストンピンボス部４，４の下端が互いに開くような変形に対しても横リブ６，６と協働して十分な剛性を確保することができる。 By having the skirt part opening 8 in the piston skirt part 3, the weight of the piston 1 can be reduced and the inertial mass can be further reduced.
Since the skirt portion opening 8 is a perforated defect portion obtained by piercing the piston skirt portion 3 and the lower end edge of the piston skirt portion 3 is continuous, even if an explosion load acts on the piston top surface, a pair of piston pin boss portions Even when the lower ends of 4 and 4 open to each other, sufficient rigidity can be secured in cooperation with the lateral ribs 6 and 6.

以上のような構造のピストン１は、鋳造成形される。
縦リブ５，５の間を連結する横リブ６の横リブ貫通口７は、ピストンヘッド２の裏面に近い奥に形成され、外側をピストンスカート部３、両側を縦リブ５，５、内側を他方の横リブ６に囲まれているので、加工・成形が難しい場所であるが、本ピストン１はピストンスカート部３に横リブ貫通口７より開口面積が大きく正面視で対向する位置にスカート部開口８を設けるので、図４に示すように、スカート部開口８とこれより開口面積が小さい横リブ貫通口７とに共通のスライド中子10（図４に２点鎖線で示す）を配置してスカート部開口８と横リブ貫通口７とをピストン１の鋳造時に同時に鋳造成形することができる。 The piston 1 having the above structure is cast.
The lateral rib through-hole 7 of the lateral rib 6 that connects between the longitudinal ribs 5 and 5 is formed in the back near the back surface of the piston head 2, the piston skirt portion 3 on the outside, the longitudinal ribs 5 and 5 on both sides, and the inside Since it is surrounded by the other lateral rib 6, it is a difficult place to process and mold, but the piston 1 has a larger opening area than the lateral rib through-hole 7 and the skirt portion at a position facing the piston skirt portion 3 in front view. Since the opening 8 is provided, as shown in FIG. 4, a common slide core 10 (shown by a two-dot chain line in FIG. 4) is disposed in the skirt portion opening 8 and the lateral rib through-hole 7 having a smaller opening area. Thus, the skirt portion opening 8 and the lateral rib through-hole 7 can be cast at the same time as the piston 1 is cast.

したがって、従来の置き中子を使用して鋳造するよりも少ない作業工数で簡単に横リブ貫通口７をスカート部開口８と同時に鋳造成形することができ、ピストン１の製造コストの上昇を抑えることができる。   Therefore, it is possible to easily cast the lateral rib through-hole 7 simultaneously with the skirt portion opening 8 with less work man-hours than casting using a conventional placing core, and to suppress an increase in the manufacturing cost of the piston 1. Can do.

また、ピストンの鋳造に際しては、ピストンスカート部３のスカート部開口８を同時に鋳造した後、図５に示すように、成形されたスカート部開口８に加工刃15（図５に２点鎖線で示す）を外側から挿入して横リブ６の所要箇所に横リブ貫通口７を切削加工することができ、鋳造時の型の構成部材および作業工数をより削減し、スカート部開口８を利用して横リブ貫通口７を簡単に切削加工でき、加工工数を少なくして製造コストの低減を図ることができる。   In casting the piston, the skirt part opening 8 of the piston skirt part 3 is cast at the same time, and then, as shown in FIG. 5, a machining blade 15 (shown by a two-dot chain line in FIG. 5) is formed in the formed skirt part opening 8. ) Is inserted from the outside to cut the horizontal rib through-hole 7 at a required portion of the horizontal rib 6, further reducing the number of mold components and work man-hours during casting, and utilizing the skirt opening 8. The horizontal rib through-hole 7 can be easily cut, and the manufacturing cost can be reduced by reducing the number of processing steps.

次に、第２の実施の形態に係るピストン31について図６ないし図９に基づいて説明する。
本ピストン31は、前記第１の実施の形態に係るピストン１とピストンスカート部33に形成されるスカート部開口38の形状が異なる以外殆ど同じ構造をしているので、同じ部分は同じ符号を用いることとする。 Next, a piston 31 according to a second embodiment will be described with reference to FIGS.
The piston 31 has almost the same structure except that the shape of the skirt opening 38 formed in the piston skirt 33 is different from the piston 1 according to the first embodiment. I will do it.

本ピストン31のピストンスカート部33に形成されるスカート部開口38は、ピストンスカート部33を先端縁から切り欠いた切欠き欠損部である。
スカート部開口38は、前記ピストン１の略矩形に穿孔欠損されたスカート部開口８を形成するピストンスカート部３の連続した下端縁を削除した構造である。 A skirt portion opening 38 formed in the piston skirt portion 33 of the piston 31 is a notch deficient portion in which the piston skirt portion 33 is notched from the tip edge.
The skirt portion opening 38 has a structure in which the continuous lower end edge of the piston skirt portion 3 that forms the skirt portion opening 8 that is perforated and missing in the substantially rectangular shape of the piston 1 is deleted.

よって、ピストンスカート部33は、ピストンヘッド２の近傍からスカート部開口38により二股に分かれて下方に垂設されており、図７に示すように、ピストン31の正面視で、スカート部開口38の上部に偏った位置に横リブ貫通口７が対向していて、スカート部開口38を通して奥に横リブ貫通口７を見ることができる。 Therefore, the piston skirt portion 33 is bifurcated downward from the vicinity of the piston head 2 by the skirt portion opening 38, and as shown in FIG. The lateral rib through-hole 7 is opposed to the position biased upward, and the lateral rib through-hole 7 can be seen in the back through the skirt opening 38.

ピストンスカート部33により開口面積の大きいスカート部開口38を有することで、ピストン31の軽量化を促進して慣性質量を益々低減することができる。   By having the skirt portion opening 38 having a large opening area by the piston skirt portion 33, the weight of the piston 31 can be promoted and the inertial mass can be further reduced.

スカート部開口38は、ピストンスカート部33を先端縁から切り欠いた切欠き欠損部であるので、ピストン31の鋳造時に中子を用いずにスカート部開口38を成形することができ、鋳造型の構成部材および作業工数を削減して鋳造コストを低減でき、こうして形成したスカート部開口38に加工刃15（図９に２点鎖線で示す）を外側から挿入して横リブ６の所要箇所に横リブ貫通口７を切削加工することができる。   Since the skirt portion opening 38 is a notch deficient portion in which the piston skirt portion 33 is cut off from the leading edge, the skirt portion opening 38 can be formed without using a core when the piston 31 is cast. The casting cost can be reduced by reducing the number of components and the number of man-hours. A processing blade 15 (shown by a two-dot chain line in FIG. 9) is inserted into the skirt opening 38 formed in this way from the outside, and the lateral rib 6 is placed at a required position. The rib through-hole 7 can be cut.

スカート部開口38が切欠き欠損部であるため、加工刃15による横リブ貫通口７の切削加工作業が極めて容易である。
以上のように、ピストン31の鋳造および横リブ貫通口７の切削加工が容易に行えるので、製造コストを低減することができる。 Since the skirt opening 38 is a notch defect, the cutting operation of the lateral rib through-hole 7 by the processing blade 15 is extremely easy.
As described above, the casting of the piston 31 and the cutting of the lateral rib through-hole 7 can be easily performed, so that the manufacturing cost can be reduced.

なお、本ピストン31も前記実施の形態で図４に示したと同じように、スカート部開口38とこれより開口面積が小さい横リブ貫通口７とに共通のスライド中子を配置してスカート部開口38と横リブ貫通口７とをピストン31の鋳造時に同時に鋳造成形することもでき、少ない作業工数で簡単に横リブ貫通口７をスカート部開口38と同時に鋳造成形することができ、ピストン31の製造コストの上昇を抑えることができる。   In the piston 31 as well, as shown in FIG. 4 in the above embodiment, a common slide core is arranged in the skirt opening 38 and the lateral rib through-hole 7 having a smaller opening area than the skirt opening. 38 and the horizontal rib through-hole 7 can be cast at the same time as the piston 31 is cast, and the horizontal rib through-hole 7 can be easily cast simultaneously with the skirt opening 38 with a small number of work steps. An increase in manufacturing cost can be suppressed.

本発明の一実施の形態に係るピストンの斜め下から視た斜視図である。It is the perspective view seen from diagonally below of the piston which concerns on one embodiment of this invention. 同ピストンの正面図（図１におけるII矢視図）である。It is a front view (II arrow line view in FIG. 1) of the piston. 同ピストンの裏面図（図１におけるIII矢視図）である。It is a reverse view (III arrow directional view in FIG. 1) of the piston. 同ピストンの断面（図３のIV−IV線断面図）である。It is a cross section (IV-IV line sectional view of Drawing 3) of the piston. 同ピストンの同じ断面図である。It is the same sectional view of the piston. 別の実施の形態に係るピストンの斜め下から視た斜視図である。It is the perspective view seen from diagonally lower of the piston which concerns on another embodiment. 同ピストンの正面図（図６におけるVII矢視図）である。FIG. 7 is a front view of the piston (as viewed in the direction of arrow VII in FIG. 6). 同ピストンの裏面図（図６におけるVIII矢視図）である。It is a reverse view (the VIII arrow view in FIG. 6) of the piston. 同ピストンの断面（図８のIX−IX線断面図）である。FIG. 9 is a cross-section of the piston (a cross-sectional view taken along line IX-IX in FIG. 8).

符号の説明Explanation of symbols

１…ピストン、２…ピストンヘッド、３…ピストンスカート部、４…ピストンピンボス部、４ｈ…ピン孔、５…縦リブ、６…横リブ、７…横リブ貫通口、８…スカート部開口、
31…ピストン、33…ピストンスカート部、38…スカート部開口。 DESCRIPTION OF SYMBOLS 1 ... Piston, 2 ... Piston head, 3 ... Piston skirt part, 4 ... Piston pin boss part, 4h ... Pin hole, 5 ... Vertical rib, 6 ... Horizontal rib, 7 ... Horizontal rib through-hole, 8 ... Skirt part opening,
31 ... Piston, 33 ... Piston skirt, 38 ... Skirt opening.

Claims (6)

ピストンヘッドの裏面に互いに対向するピストンスカート部間を各々ピストンピンボス部が形成された一対の相対向する縦リブが連結し、
前記相対向する縦リブ間を一対の横リブが連結し、
前記横リブに前記ピストンヘッドの裏面近傍に横リブ貫通口を設けたピストンにおいて、
前記ピストンスカート部の前記横リブに対向し前記横リブ貫通口に臨む部分が欠損されてスカート部開口が形成されたことを特徴とするピストン。 A pair of opposed longitudinal ribs each formed with a piston pin boss portion are connected between the piston skirt portions facing each other on the back surface of the piston head,
A pair of horizontal ribs connect between the opposing vertical ribs,
In the piston provided with a lateral rib through-hole in the vicinity of the back surface of the piston head on the lateral rib,
2. A piston according to claim 1, wherein a portion of the piston skirt portion facing the lateral rib and facing the lateral rib through-hole is lost to form a skirt portion opening. 前記スカート部開口が、前記ピストンスカート部を穿孔した穿孔欠損部であることを特徴とする請求項１記載のピストン。   2. The piston according to claim 1, wherein the skirt portion opening is a perforation defect portion obtained by perforating the piston skirt portion. 前記スカート部開口が、前記ピストンスカート部を先端縁から切り欠いた切欠き欠損部であることを特徴とする請求項１記載のピストン。   The piston according to claim 1, wherein the skirt portion opening is a notch defect portion obtained by notching the piston skirt portion from a leading edge. 前記スカート部開口の開口面積が、前記横リブ貫通口の開口面積よりも大きいか等しいことを特徴とする請求項１から請求項３までのいずれか１項記載のピストン。   The piston according to any one of claims 1 to 3, wherein an opening area of the skirt portion opening is larger than or equal to an opening area of the lateral rib through-hole. 前記ピストンの鋳造時に前記スカート部開口と前記貫通口とが共通のスライド中子により同時に鋳造成形されることを特徴とする請求項４記載のピストン。   5. The piston according to claim 4, wherein the skirt portion opening and the through-hole are simultaneously cast and molded by a common slide core when the piston is cast. 前記ピストンの鋳造時に前記スカート部開口が同時に鋳造成形され、
成形された前記スカート部開口に加工刃を外側から挿入して前記横リブの所要箇所に前記横リブ貫通口を切削加工することを特徴とする請求項１から請求項４までのいずれか１項記載のピストン。 When the piston is cast, the skirt portion opening is cast and molded at the same time,
The cutting edge is inserted into the formed skirt opening from the outside, and the horizontal rib through hole is cut at a required position of the horizontal rib. The described piston.
JP2008310453A 2008-12-05 2008-12-05 piston Expired - Fee Related JP4861394B2 (en)

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